Answers by anony mous

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When calcium carbonate was added to a solution of dry hydrogen chloride in methyl benzene there was no observable reaction. Explain.

answered Jul 7, 2021 in Chemistry Form 3

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When a current of 0.5 amperes was passed for 32 minutes and 10 seconds through fused chloride of metal P 0.44 of P was deposited. Determine the charge of the ion of metal P. (IF = 96,500C, P =88)

answered Jul 7, 2021 in Chemistry Form 4

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50cm3 of oxygen gas diffused through a porous plug in 80 secs. How long will it take 100cm3 of sulphur (IV) oxide to diffuse through the same plug? (S = 32 0= 16)

answered Jul 7, 2021 in Chemistry Form 3

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The structure below represents a segment of a polymer. Use it to answer the questions that follow.

answered Jul 7, 2021 in Chemistry Form 4

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Identify the following cleansing agents

answered Jul 7, 2021 in Chemistry Form 4

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A gaseous compound consists of 86% carbon and 14% hydrogen by mass. At s.t.p, 3.2dm3 of the compound has a mass of 6g. (C = 12 H = 1 molar gas volume at s.t.p = 22.4dm3)

answered Jul 7, 2021 in Chemistry Form 3

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Using dots (•) and crosses (x) show bonding in; (C = 2, 0 = 16, H = 1)

answered Jul 7, 2021 in Chemistry Form 2

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The table below shows the pH values of solution J to N

answered Jul 7, 2021 in Chemistry Form 4

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Study the experimental set up of apparatus shown below.

answered Jul 7, 2021 in Chemistry Form 2

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A white solid L changes to yellow solid R when strongly heated but on cooling becomes white again. When L is reacted with dilute nitric(v) acid effervescence occurs.

answered Jul 7, 2021 in Chemistry Form 4

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The standard reduction potentials of two half cells are

answered Jul 7, 2021 in Chemistry Form 4

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Nitrogen reacts with oxygen according to the equation.

answered Jul 7, 2021 in Chemistry Form 3

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An aqueous solution of hydrogen chloride can be prepared as shown in the diagram below.

answered Jul 7, 2021 in Chemistry Form 3

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The following elements belong to the same group of periodic table.

answered Jul 7, 2021 in Chemistry Form 2

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Describe how you would prepare dry sample of lead (II) chloride starting with lead (II) carbonate.

answered Jul 7, 2021 in Chemistry Form 4

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The table below gives some experimental results on four samples of water. Use the information to answer the questions that follow.

answered Jul 7, 2021 in Chemistry Form 4

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The lattice energy of sodium bromide and hydration energies of sodium and bromide ions are 733,406 and 335kj/mol respectively.

answered Jul 7, 2021 in Chemistry Form 4

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Define molar heat solution.

answered Jul 7, 2021 in Chemistry Form 4

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70g of salt W were added to 80cm3 of water at 25°C. After stirring 10g of crystals of salt were filtered out. Determine the solubility of salt W at 25°C.

answered Jul 7, 2021 in Chemistry Form 2

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An element has isotopic species A and B each with a mass number 39 and 40 respectively. The percentage of A is 60% and B is 40% for an isotopic element X. Calculate the relative atomics mass of X.

answered Jul 7, 2021 in Chemistry Form 2

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